The Lee CFCD for 45 colt is a roll crimp die with a post-sizing ring at the bottom. If the cartridge is longer than what it was designed for, it can still be used OK, but the post sizing ring may not get all the way to the bottom of the brass. This would likely not be a problem anyway, since it is there to iron out buckles in the case caused by the crimping, which tend to be located up higher on the brass.

BTW, I'm not a particular fan of my CFCD in 45 colt. I like the crimp from my Hornady seating die better, and it does it while I seat the bullet.

The FCD has its place for progressive loading large volumes of cartridges that are not trimmed to uniform length, which is usually the cause of the buckling that the CFCD irons out.